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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_MEMORY_SHARED_MEMORY_TRACKER_H_
#define BASE_MEMORY_SHARED_MEMORY_TRACKER_H_
#include <map>
#include <string>
#include "base/base_export.h"
#include "base/memory/shared_memory_mapping.h"
#include "base/synchronization/lock.h"
#include "base/trace_event/base_tracing.h"
namespace base {
namespace trace_event {
class MemoryAllocatorDump;
class MemoryAllocatorDumpGuid;
class ProcessMemoryDump;
} // namespace trace_event
// SharedMemoryTracker tracks shared memory usage.
class BASE_EXPORT SharedMemoryTracker : public trace_event::MemoryDumpProvider {
public:
// Returns a singleton instance.
static SharedMemoryTracker* GetInstance();
SharedMemoryTracker(const SharedMemoryTracker&) = delete;
SharedMemoryTracker& operator=(const SharedMemoryTracker&) = delete;
static std::string GetDumpNameForTracing(const UnguessableToken& id);
static trace_event::MemoryAllocatorDumpGuid GetGlobalDumpIdForTracing(
const UnguessableToken& id);
// Gets or creates if non-existant, a memory dump for the |shared_memory|
// inside the given |pmd|. Also adds the necessary edges for the dump when
// creating the dump.
static const trace_event::MemoryAllocatorDump* GetOrCreateSharedMemoryDump(
const SharedMemoryMapping& shared_memory,
trace_event::ProcessMemoryDump* pmd);
// Records shared memory usage on valid mapping.
void IncrementMemoryUsage(const SharedMemoryMapping& mapping);
// Records shared memory usage on unmapping.
void DecrementMemoryUsage(const SharedMemoryMapping& mapping);
// Root dump name for all shared memory dumps.
static const char kDumpRootName[];
private:
SharedMemoryTracker();
~SharedMemoryTracker() override;
// trace_event::MemoryDumpProvider implementation.
bool OnMemoryDump(const trace_event::MemoryDumpArgs& args,
trace_event::ProcessMemoryDump* pmd) override;
static const trace_event::MemoryAllocatorDump*
GetOrCreateSharedMemoryDumpInternal(void* mapped_memory,
size_t mapped_size,
const UnguessableToken& mapped_id,
trace_event::ProcessMemoryDump* pmd);
// Information associated with each mapped address.
struct UsageInfo {
UsageInfo(size_t size, const UnguessableToken& id)
: mapped_size(size), mapped_id(id) {}
size_t mapped_size;
UnguessableToken mapped_id;
};
Lock usages_lock_;
std::map<void*, UsageInfo> usages_ GUARDED_BY(usages_lock_);
};
} // namespace base
#endif // BASE_MEMORY_SHARED_MEMORY_TRACKER_H_
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